/**
 * Created by 19222 on 2018/4/16.
 */
public class toulaofenbao {
    public static void main(String ... args )
    {
        double average =0;
        int number =args.length;
        int n =number -1;
        for (int a =1; a<=n; a++)
            average += Integer.parseInt(args[a]);
        

        System.out.println("学号 "  + args[0]);
        
        System.out.println("平均数：" +(average)/n);


    }
}
